Amiga 1222: Catweasel MK4 and a graphics card at the same time?

Topic says it all, as they say. From what I understand, the Amiga 1222 only has a single PCI Express slot meant for graphics cards. There are, however, PCI splitters that potentially allow users to connect two (2) cards to one (1) slot.

Does the Amiga 1222 and the OS support setups like these? If yes - is it possible to hook up a Catweasel MK4 floppy/keyboard/joystick controller board to an A1222 along with a Radeon graphics card?

Short answer: no

Long answer #1: probably not
PCIe slot in A1222 is x16 mechanically, but only x4 lane electrically. And you must divide it to two ( or more ) parts.

As bifurcation of PCIe port not supported now in firmware, you need PCIe switch and not PCIe splitter. I.e. PCIe card with onboard switch and PCIe connectors.
Switch has to be capable for switching 4 lanes, ideally PCIe x4 to 2x PCIe x4 or PCIe x4 to 2x PCIe x2.
I am not sure, if such cards exists.
Alternativelly there are many switches PCIe x1 to 4x PCIe x1, but with these speed to graphics card will be very limited. Not recommended.

And of course, Catweasel is PCI, not PCIe. It means you need additional PCIe-PCI bridge. And even if it will works ( probably not, switch+bridge, is too complex for firmware), you ended with real monster and not fit to Mini-ITX case.

Long answer #2: maybe in future
CPU P1022 has upto three internal PCIe roots. So it can be configured to support this combinations:
i) PCIe x4 .. this is A1222 firmware setting
ii) PCIe x2 x2
iii) PCIe x2 x1 x1
If sometimes in future U-Boot will be upgraded and will support bifurcation, you can connect simple PCIe splitter and use two or three PCIe cards.
And PCIe-PCI bridge applies here too.

You can try to use Display unit on A1222.
If you remove your graphics card you can connect motherboard DVI to monitor. Display works only if graphics card is not present, and has lower resolution and no hw acceleration.
But you can try, if Display still works if you connect (other than graphics) PCIe card.

@FirstNinja

No. The firmware doesn't support this, and even if it did, you wouldn't want to do it given the bandwidth challenges. I also wouldn't recommend using the DIU, either. It's very limited in terms of resolution, and there is no acceleration whatsoever.

Hopefully soon there will be an option to use USB-based floppy drives.

-- eliyahu

@FirstNinja

The Catweasel Mk2 can be connected to an IDE port. AmigaKit did sell a cable and drivers so it could be used with the X1000's IDE port. In theory it should work with a SATA to IDE adapter, Epsilon has this setup so maybe he could test it with his A1222 to confirm.

Catweasel Mk2 shouldn't be anymore difficult to find than the PCI versions. I'm sure if you contact Amigakit (best to PM at amiga.org) they'd be willing to supply the required cable and drivers.